noun, plural bugaboos.
something that causes fear or worry; bugbear; bogy.

1730–40; earlier buggybow. See bogy, boo

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World English Dictionary
bugaboo (ˈbʌɡəˌbuː)
n , pl -boos
an imaginary source of fear; bugbear; bogey
[C18: probably of Celtic origin; compare Cornish buccaboo the devil]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1843, earlier buggybow (1740), probably an alteration of bugbear (see bug), but connected by Chapman [DAS] with Bugibu, demon in the O.Fr. poem "Aliscans" from 1141, which is perhaps of Celtic origin (cf. Cornish bucca-boo, from bucca "bogle, goblin").
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Because of that old museum curator's bugaboo: ultraviolet light.
Now, free parking is a favorite bugaboo of a certain strain of microeconomists
  and economically minded commentators.
As always, the bugaboo is lift, since every additional measure of weight
  requires a vast addition of volume to hold gas.
Next, the population explosion is also turning out to be a bugaboo.
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